Which of the following is NOT involved in the activation of glucose for glycogen synthesis?   A. Phosphorylation of glucose by hexokinase to glucose-6-phosphate.   B. Isomerization of glucose-6-phosphate to fructose-6-phosphate by phosphohexose isomerase.   C. Two-step phosphoryl group transfer by phosphoglucomutase.   D. Attachment of glucose-1-phosphate to UDP.

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